2. Print our blueprints. If you print them on a a4 sheet you will get a portal large enough for normal 40k Eldar tanks to pass through

3. Cut the blueprints to make templates then copy the shapes on thick cardboard or foamcore (or whatever material you want to use for your portal)

4. If you use corrugated cardboard, mask its edges with painting tape as with bases

Each "wing" is a sandwich made of two pieces b with one piece a in between. A forth bit e is then glued perpendicularly to strengthen the wing's frame and stripes f for decoration
— letters correspond to the markings on our blueprints

5. Prepare steps of the portal by glueing together a single narrow piece of cardboard d to a couple of layers of wider cardboard c

6. Glue the wings onto the steps. Strengthen the portal by pressing nails through the steps to connect them firmly to the wings

7. Glue the portal to its base

8. Add gems g, i and j made of green stuff or salvaged from your bits box. I added some wiring made from twisted wire stretched between the gems g

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